Yeah well I didn't like the whole "immune to the force" thing. That sounded like something a bad GM would think up to pose a challenge for the group. We have already the Ysalamiri with their force-jamming field.
For as much **** as the series gets, I have a bit of grudging respect for it. I think it was the first series that was willing to kill off an established character. That's gutsy and I think it's a shot in the arm for the EU. Reading some of the EU it's weird to realize that Han is 60+ and still romping around the galaxy doing **** like he's the same young man from A New Hope. I mean it's a huge galaxy and we are still telling stories about the same two families. Making them mortal clears the way for expanding to tell new stories about new heroes.
It pretty much read like: "We've written ourselves into a corner, where there's absolutely no obstacle in the galaxy that cannot be overcome by sufficient application of force plot-magic. So let's introduce something from out of the galaxy, more or less impervious to technology, immune to the force, and let's make it creepy, to boot."
To be fair, they had written themselves into that corner. With the Force as plot-magic it's difficult to generate new and interesting antagonists. How many Sith Lords can you fight before it gets dull? I think it was worth trying to mix it up, but it was sort of a trainwreck.
As a tangent, I wonder how much they were influenced by the Thrawn material. You've got a previously unheard of species showing up out of nowhere with military prowess and cunning. At the same time you have the Jedi's space magic mitigated in some organic way. I can see where they pulled some ideas from one of the most well received stories and tried to recapture that. Anyway, just a thought I had while thinking over the vast EU material.